Abstract
In this work, the challenges associated with the formation of single and bilayer coatings based on Ce0.8Sm0.2O1.9 (SDC) and CuO modified BaCe0.5Zr0.3Y0.1Yb0.1O3−δ (BCZYYbO-CuO) solid state electrolytes on porous non-conducting NiO-SDC anode substrates by the method of electrophoretic deposition (EPD) are considered. Various approaches that had been selected after analysis of the literature data in order to carry out the EPD, are tested: direct deposition on a porous non-conductive anode substrate and multiple options for creating the conductivity of the anode substrate under EPD conditions such as the reduction of the NiO-SDC substrate and the creation of a surface conducting sublayer via synthesizing a polypyrrole (PPy) film. New effective method was proposed based on the deposition of a platinum layer on the front side of the substrate. It was ascertained that, during the direct EPD on the porous NiO-SDC substrate, the formation of a continuous coating did not occur, which may be due to insufficient porosity of the substrate used. It was shown that the use of reduced substrates leads to cracking and, in some cases, to the destruction of the entire SDC/NiO-SDC structure. The dependence of the electrolyte film sinterability on the substrate shrinkage was studied. In contrast to the literature data, the use of the substrates with a reduced pre-sintering temperature had no pronounced effect on the densification of the SDC electrolyte film. It was revealed that complete sintering of the SDC electrolyte layer with the formation of a developed grain structure is possible at a temperature of 1550 °C.
Highlights
Based on the results of electrophoretic deposition (EPD) on non-conductive porous anodes presented in the study of Besra et al [50], we carried out a series of experiments in which a porous nonconductive substrate was placed on a metal electrode of the EPD cell and a stainless-steel plate served as a counter electrode
This work presents the results of studies on the formation of thin-film SDC electrolyte and bilayer BCZYYbO-CuO/SDC electrolyte on the porous non-conducting NiO-SDC
The work was aimed at identifying key features and possible implementations of the full technological cycle: characterization of the powders used, preparation of the suspensions based on the SDC and BCZYYbO-CuO powder materials in a nonaqueous medium, establishment of optimal deposition modes on the model substrates, implementation of direct EPD on the porous non-conductive NiO-SDC anode substrates, EPD on the reduced Ni-SDC anode substrates, EPD on the NiO-SDC anode substrates with different conductive sublayer (PPy, Pt), and study of the sintering kinetic of the substrates and deposited layers
Summary
1200–1250 ◦ C were reached when using for their deposition the anode substrates with intrinsic microporosity fabricated by ceramic injection molding from the mixture of NiOYSZ and polymer binders (PEG and PVB resin) without any pre-sintering step [30] or when using for EPD nano-sized YSZ electrolyte material subjected special treatment to destroy agglomerates [23] In another approach, electrolyte layers are deposited on highly conducting reduced anode substrates [28,33,42]. An alternative method for creating solid electrolyte films is proposed based of the surface modification of a non-conductive anode substrate by the deposition of a platinum sublayer on its front surface The implementation of this approach makes it possible to carry out multiple deposition-sintering cycles while maintaining the conductivity of the substrate under EPD conditions
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